I'n new in BPMN and ATL and I begin working with ATL transformations from BPMN 2.0 to other languages.
I've problems when I run the transformations.
I've an error in the XMI file of the model: "value of TargetNamespace is not legal".
I've tested with several (normally corrects) values and I've always the same error.
I think that's would be related with the issue (16398) in www.omg.org/issues/bpmn2-rtf.open.html:

Issue 16398: XML Schema not valid (bpmn2-rtf)

Nature: Clarification
Severity: Significant
Summary:
The official XML Schema for BPMN 2.0 (www.omg.org/spec/BPMN/20100501/BPMN20.xsd) is not valid.

- It imports a schema with the schemaLocation "www.omg.org/spec/BPMN/20100501/Diagram Interchange.xsd", which does not exist.
Even when using the correct schemaLocation of "www.omg.org/spec/BPMN/20100501/DI.xsd", the namespace does not match (www.omg.com/di/1.0.0 vs. www.omg.org/spec/DD/20100524/DI)
(Note that one uses "omg.com" and the other uses "omg.org".)

- It includes the Schema "www.omg.org/spec/BPMN/20100501/Semantic.xsd", but its targetNamespace www.omg.org/spec/BPMN/20100524/MODEL does not match the including schema's value.